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Finding the Fourth Proportional to 919.55, 1,268.96 and 499.91

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Solution

The fourth proportional to 919.55, 1,268.96 and 499.91 is: 689.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.55 : 1,268.96 = 499.91 : x
  2. Step 2: Convert to fraction form
    919.55/1,268.96 = 499.91/x
  3. Step 3: Cross multiply
    919.55x = 1,268.96 × 499.91
  4. Step 4: Simplify right side
    919.55x = 634,356.95
  5. Step 5: Solve for x
    x = 634,356.95/919.55
  6. Step 6: Final answer
    x = 689.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.